Question: Who is the  {operationalization} for {manifestation of} of {inertia}
Paraphrase: Who is the {operationalization} for {sign of} of {inertia}
SPARQL (Wikidata):  select distinct ?sbj where { ?sbj wdt:P1557 wd:Q122508 . ?sbj wdt:P31 wd:Q286017 } 
Answer: inertial mass